Safety by-pass for stoves anx



June 20, 1944, 'WlNGERT I 2,352,057

SAFETY BYLPASS FOR STOVES AND FURNACES Filed Feb. '7, 1941 .safety by-pass means therefor.

Patented June 20, 1944 UNITED STATES PTENT OFFICE SAFETY BY-PAss FOR s'rovrs' AND FURNACES Paul Wingert, Montpelier, Ohio Application February '7, 1941, Serial No. 377,825

, 3 Claims.

This invention relates to improvements in stoves and furnaces and more particularly to a This application is a continuation in part of my copending application, Serial No. 322,730, filed March 7, 1940 now Patent No; 2,284,464, May 26, 1942, Furnace and stove constructions.

In stoves and furnaces of the type having for sealed fuel magazines there is always a coal gas accumulation above the fuel bed. Upon the opening of the feed door the sudden admission of vide an improved safety by-pass damper arrangement for stoves and furnaces; to provide such a safety by-pass means whereby gases, accumulating, over a fuel bed in a sealed magazine of a stove or furnace, are automatically released into the smoke stack from the upper end of the magazine when the fuel feed door is opened; and to provide a simplified arrangement of the character described which is positive in operation and inexpensive to manufacture and apply.

Specific embodiments of this invention are shown in the accompanying drawing, in which:

Figure 1 is a vertical cross-sectional View illustrating a furnace embodying my improvement.

Fig. 2 is a perspective view of the safety bypass closure plate shown in Fig. 1.

Fig. 3 is a vertical cross-sectional view illustrating a stove embodying a modified form of my invention.

Fig. 4 is a fragmentary cross-sectional view showing my by-pass arrangement in open or operative position.

Referring to the drawing, the furnace shown in Fig. 1 of the drawing, and in which my invention is embodied for illustrative purposes, is fully disclosed and claimed in my copending application, Serial No. 322,730, filed March 7, 1940, for Furnace and stove constructions. This furnace is provided with a shell I; a set of centrally dis-posed grates 2 spaced above an ash pit 3; a fire brick or other refractory lining 4 extending upwardly from the level of the margins of the grates 2 to define a fuel bowl; combustion chamber or fire pot 5; a fuel reservoir or magazine 6; a fuel feed door 7; a dome-like portion or horizontally disposed radiator 8 disposed above the against the bearing plate reservoir 6 and located at the top of the shell'l; a safety lay-pass damper 9 located in the lower wall of the radiator 8; a plenum chamber in disposed adjacent the fire brick lining 4; and a series of spaced vertically disposed radiators H, each communicating with and connected between the plenum. chamber H3 and the radiator 8.

The safety hy-pass 9 comprises a plate 12 of suitable material secured adjacent itsoutermost end to the lower wall of the radiator 8 by any suitable means, such as loosely arranged pins or pivots [3. Th plate i2 is provided with an arm it secured medially of the plate and having one end projecting outwardly beyond the plate to- Ward the fuel door 1. The distal end of the arm it is bent downwardly and inwardly to form an arcuate surface l5, which is arranged to abut l5 when the door 1 is closed.

When thedoor l is opened, the arcuate end -I 5. of the arm 14 swings upwardly relative to the pivots i3 while the plate I 2 swings downwardly by gravity to expose th discharge orifice H in the bottom of the radiatoril, thus providing an opening to allow anyaccumulated gases .to flow upwardly into the radiator 8 and thenceto the stack opening 8'. When the door I is closed, the bearing plate 16 abuts against the arcuate end portion l5 of arm E4, causing it to move in a downward direction, thereby swinging the plate l2 upwardly to abut against the bottom of the radiator 8 and close the orifice IT. The area of the plate 12 is greater than th area of the opening H, as will be understood.

Referring to Fig. 3 of the drawing, the stove shown therein, and in which a modified form of my invention is embodied for illustrative purposes, is fully disclosed and claimed in my cop-ending applications, Serial No. 398,785 filed June 19, 1941, for Internal constructions for stoves and furnaces, and Serial No. 377,511, filed February 25, 1941, now Patent No. 2,345,519, March 28, 1944, for Draft tube for stoves and furnaces, respectively.

The stove is provided with a shell l8; a sealed magazine l9; the lower part of which is lined with fire brick 26 to define fire pot 2i; grates 22; an ash pit 23; a fuel feed door 24; an upper chamber 25, defined by the side walls of the shell i8, the top covering of the stove proper 26, and partition plates 21 and 23; a stack opening 29; a draft tube 30; and primary draft and check dampers Ill and Bi respectively.

The modified form of safety by-pass arrangement illustrated in this stove comprises a discharge orifice 32; a closure plate 33, of an area. which is greater than the area of the orifice 32, pivotally hinged loosely to the partition 21 in any suitable manner such as by the integrally secured hooks 34, the ends of which are inserted zine l9 and the plate 33 will swing downwardly automatically by gravity, thereby exposing the opening 32 to allow any gas accumulating in the upper portion of the magazine I9 to flow upwardly into the upper chamber 25 and thence out the stack opening 29. When the feed door 24 is closed, the upper inwardly extending edge of-the arm 36 will abut against the lower surface of plate 33 and swing it about its pivot and move it upwardly to close the opening 32.

This by-pass arrangement is extremely advantageous in stoves and furnaces having sealed magazines that are of the angular cross draft type where combustion takes place at the grate line and the products thereof are also taken off at the grate line.

Although but two specific embodiments of this invention is herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims:

I claim:

1. In stove and furnace constructions the combination of a sealed magazine having a discharge orifice in its top wall, a feed door in the side wall of the stove and opening into said magazine and a stack opening, said magazine having substantially direct communication with said stack opening through said discharge orifice, a safety by-pass damper comprising a closure plate pivotally mounted at one edge to the top wall of said magazine adjacent said feed door and arranged to cover said discharge orifice, and camming means secured to the inner side of said door for automatically operating said plate whereby upon opening said door said plate will swing downwardly on its pivot by gravity to expose the discharge orifice and allow any gases accumulating in the upper portion of said magazine to pass into said stack opening, and upon closing said door said camming means will bear against said plate and close said discharge orifice.

2. In a device of the class described having a stack opening, a feed door, and a sealed magazine Y provided with a discharge opening in its top wall adjacent said feed door in the side wall of the stove, a closure plate hingedly secured to the inside top wall of said magazine to cover the discharge opening, an inwardly and upwardly extending camming arm secured to the inner wall of said door whereby when said door is closed said arm will shift said plate to close the opening in the top wall of said magazine and when said door is opened said'plate will shift downwardly by gravity to expose said opening and form adirect communication with the stack opening.

3. In stove and furnace constructions the combination of a sealed magazine having a discharge orifice in the upper end thereof, a chamber located above said magazine and having communication therewith through said discharge orifice, a fuel feed door opening into said magazine and located adjacent said discharge orifice, and a stack opening having communication with said chamber, a safety by-pass damper comprising a closure plate hingedly secured to the upper end of said sealed magazine and arranged to close said discharge orifice when said fuel feed door is closed, and camming means secured to the inner side of said fuel feed door for automatically operating said plate whereby when said fuel feed door is closed said camming means will shift said damper to close said discharge orifice and when said door is opened said plate will shift downwardly by gravity to expose said opening.

PAUL WINGERT. 

